Luckily, I learned my lesson in my late 20s (the saga of the belly button ring spans the years '96 to '98, actually.)
Still, when I had the Repo-baby two years ago, oddly enough, the small scar from the piercing reacted strangely--all of this melanin collected in it, so it looked like I had one of those weird henna/bindi tattoos there.
In fact, during my c-section, the anesthesiologist argued with me. "No!" he insisted, "that's a tattoo!"
"Uh... no... that's hormonal discoloration..."
"It looks like a sun. It's too perfect to be a random thing. If it ISNT a tattoo, I'd get it tattooed in so the design isn't lost..."
Sigh...
http://www.i-am-bored.com/bored_link.cfm?link_id=6449
Found it! Check this out...